Quartz-mill.



No. 759,802. 7 PATENTED MAY 10, 1904. E. BOOKER.

QUARTZ MILL.

APPLICATION FILED JUNE 6, 1902. N0 MODEL. 2 SHEETS SHEB-T 1.

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' PATENTED MAY 1o,1904.' E.BO0KER. QUARTZ MILL.

APPLIGATION FILED JUNE 6, 1902.

' 2 SHEETSSHEET 2.

Jhim s UNITED STATES Patented May 10, 190 1.

PATENT OEEicE.

EDWARD BOOKER, OF SAN DIEGO, CALIFORNIA, ASSIGNOR TO THE CALI- FORNIA QUARTZ MILL COMPANY PORATION OF CALIFORNIA.

, OF SAN DIEGO, CALIFORNIA, A COR- QUARTZ-MILL.

SPECIFICATION forming part of Letters Patent No. 759,802, dated May 10, 1904. Application filed June 6, 1902. Serial No. 110,492. (No model.)

To (1 1.077107% it may concern.-

Be it known that I, EDWARD Booxnn, a citizen of the United States, residing at San Diego, in the county of San Diego and State of California, have invented a new and useful Quartz- Mill, of which the following is a specification.

This invention relates generally to quartzmills, and particularly to that class of mills adapted for reducing rock and ores in mining operations.

The object of the invention is to provide a simply-constructed and thoroughly-eflicient form of quartz-mill which in operation will rapidly and with a minimum output of power I 5 reduce the quartz to the desired fineness.

A further object is to provide for the requisite adjustment of the parts of the apparatus to compensate for wear.

With these and other objects in View, as will appear as the nature of the invention is better understood, the same consists in the novel construction and combination of parts of a quartzmill, as will be hereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, and in which like numerals of reference indicate corresponding parts, there is illustrated one form of embodiment of the invention capable of carrying the same into practical operation, it being understood that the elements therein exhibited may be varied or changed as to shape, proportion, and exact manner of assemblage without departing from the spirit of the invention.

In the drawings, Figure 1 is a viewin pers pective of a quartz-mill constructed in accordance with the present invention. Fig. 2 is a view in vertical transverse section taken through the driving-shaft.

The quartz-mill herein exhibited is shown as provided with a hand-wheel by which it may be operated and is adapted more particularly for assaying work and is portable, it being understood that the larger size machines embodying the same ideas for handling large bulks of quartz will be driven by suitable mechanical power.

Referring to the drawings, 1 designates the base of the mill adapted to receive the reduced quartz and being provided at one side with an 5 outlet 2, as usual. Resting upon the base is a frame 3, comprising in this instance three legs 1, longitudinally reinforced, as at 5, the lower ends of the legs being provided with lips 6 to fit against the inner wall of the flange 5 5 7 of the base and are held in engagement therewith by locking-levers 8, engaging studs or projections 9, carried by the said flange. The upper portion of the frame is preferably rounded and is provided with a central orilice 6 that is threaded for the reception of a sleeve 10, upon which is clamped a collar I1, having an outward and downward extending arm 12, through which passes a set-screw 13, adapted to engage with sockets or depressions 14, 5 formed circumferentially of the rounded portion of the frame in order to hold the mortar 15 properly adjusted with relation to the pestle 16. The mortar is provided with a tapered bore 17, having its greatest diameter at the 7 upper end, and is further provided with a tubular throat or chute 18, which is loosely mounted within the sleeve 10-that is to say,

is free to rotate therein-the lower end of the sleeve bearing against the upper end of the mortar, and thereby effecting the adjustment before referred to.

The pestle 16 is provided with an enlarged base 19 and is of the same diameter from its upper end down to the shoulders 20, formed by the base, the said shoulders coiistituting grinding-surfaces with which the lower end of the mortar coacts, thus to effect reduction of the quartz to a fine powder or pulp. The pestle is held associated with the base by a 5 bolt 21, which passes through the base and carries at its lower end a nut'22. By this arrangement a pestle may readily be removed when worn out or for other purposes and as readily be replaced.

The upper end of the throat carries a mitergear 23, which is associated therewith through the medium of a set-screw 24, and engaging the miter-gear is a pinion 25, carried by one end of a shaft 26, the other end of which 95 carries a hand-wheel 27, provided with a crank 28. The shaft is mounted in bearings formed in a bracket 29, which is held associated with one of the legs by bolts 30 in this instance threethe openings in the lower ends of the bracket through which the bolts pass being slotted to permit of the pinion being lowered to compensate for the wearing away of the mortar, the lowering of the mortar being effected through the medium of the adjusting-arm 12 and collar 10.

A special and very important feature of my present invention consists in the relative shapes or conformations of the pestle which constitutes the inner stationary grinding member and the mortar which constitutes the outer revoluble grinding member. It has been already distinctly and specifically set forth that the bore of the mortar increases in diameter in an upward direction toward the feed end, while contact exists between said revoluble mortar and the pestle only at the lower or discharge end. hen the material to be crushed, such as fragments of ores, are fed through the feed-throat of the device, it will drop upon the upper end of the pestle and be distributed upon the inner inclined surface of the mortar. The latter be ing revoluble will practically carry the fragments resting thereon around in contact with the outer surface of the pestle, the weight of the fragments causing them to repose upon the said inclined surface and to be thus carried around, when by contact with the stationary inner grinding member the said fragments will be gradually but quickly and surely reduced to the desired degree of fineness. his is a very decided improvement over grinding devices in which an inner coniform stationary grinding member or pestle is used in conjunction with an outer revoluble grind ing member or mortar having a cylindrical bore. I/Vhen grinding members of the latter shape are used, the tendency will be for the fragments of ore or material to be ground to settle upon the inclined surface of the stationary grinding member and to remain to a large extent unaffected by the operation of the cylindrical revoluble grinding member, which having a smooth verti :al wall will to a large extent slide by the particles or fragments reposing upon the inner cone. I desire to make special mention of these facts, because a thorough and long-continued series of practical experiments have led to the conclusion that the relative construction of the grinding members of my improved quartzmill will do more and better work than grinding members of any other shape that I have tested.

It is obvious that under the rotation of the mortar when the quartz is fed down the throat 18 it is reduced to a powder not only by the grinding action of the mortar with relation to the pestle, but also from the mutual attrition of the small pieces of quartz. It will also be understood that the degree of fineness of the reduction may be regulated by raising or lowering the revoluble grinding member by the mechanism herein described.

Under the construction shown there are no sharp corners or angles presented in the working or reducing parts of the mill, and this is highly essential inmills of this character, especially when used for assaying purposes, in order to prevent one assay from salting the following one.

Another advantage accruing from the arrangement shown is the facility and ease with which the mill may be cleaned, it being only necessary to separate the mortar from the pestle to throw the locking-levers 8 out of engagement with the lugs or projections and then lift the mortar, with its attached mechanism, free from the base. As will be apparent, the substitution of a new mortar or pestle may be accomplished with the output of but a small amount of labor.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a quartz-mill, the combination with a stationary pestle of uniform diameter throughout its length and provided with an inclined shoulder near its lower end, of a rotary mortar housing the pestle, having its lower end disposed to coact with the inclined shoulder of the same, and a feed-throat extending upwardly from said mortar and attached thereto.

2. In a quartz-mill, the combination with a base having a stationary pestle detachably associated therewith, of aframe detachably connected with the base, a mortar housing the pestle and having a throat or chute, a sleeve mounted on the throat and having a threaded connection with the frame, and a collar secured to the sleeve and having an arm provided with means for engaging sockets in the frame to hold the mortar in proper adjustment with relation to the pestle.

3. In a quartz-mill, the combination with a base having a stationary pestle detachably associated therewith, of a frame detachably connected with the base, a mortar housing the pestle and having a throat or chute, a sleeve mounted on the throat and having a threaded connection with the frame, a collar secured to the sleeve and having an arm provided with means for engaging sockets in the frame to hold the mortar in proper adjustment with relation to the pestle, supporting means adjustably associated with the frame, a shaft journaled in the said supporting means, and means for transmitting motion between said shaft and the throat of the mortar.

In testimony that I claim the foregoing as my own I have hereto aifixed my signature in the presence of two witnesses.

EDWARD BOOKER.

Witnesses:

J. S. AKERMAN,

JAMES M. STEADE. 

